The battery energy storage system (BESS ENERGY STORAGE SYSTEM) is afford storing electric energy of the light load zone release time of the maximum load that may be referred to enable the device.Technical problems in the past due to cost and practical application of the burden to have had a lot of trouble. Due to recent advances in electric vehicles and energy storage devices, the weight of the product density, and product price declines to bring such products to use the matching conditions favorable due to recent social product is applied in many areas and the study who being accelerated. The installation of the battery energy storage products is the maximum energy load of the building users and the required time for the charges to enable the effective use of energy in the building to ease the economic burden of the users have had the energy to give energy providers the burden on the facility expansion this can be a benefit by reducing each other can be described as a method. In fact, the electrical energy storage facilities near field can be said more, but the actual large office building in the applying existing facilities and use of electrical energy for the estimation of the amount provided by the Institute of Energy Research, public buildings energy relative coefficient is used to obtain and afford the actual usage pattern by comparing the work proceeds. Electric energy savings and light load hours of the base rate and the maximum load of the electric peak shaving time by looking at how much it costs to save energy costs and payback period of the initial investment products see if how much can be said for the research.